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KMID : 0861420100140020093
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Korean Journal of Nuclear Medicine Technology
2010 Volume.14 No. 2 p.93 ~ p.99
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Examination about Utility of Prone Position in PET/CT of Stomach Cancer Patient
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Namkoong Hyuk
Park Hun-hee
Oh Shin-Hyun
Bahn Young-Kag
Kim Jung-Yul
Lim Han-Sang
Lee Chang-Ho
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Abstract
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Purpose: Currently, PET/CT scan has been known to provide useful information to both preoperative and
postoperative examination of cancer patients. Contracted stomach by the long fasting could cause difficulties of
interpretation because of its size on reconstructed image data. To solve this problem, after the whole body
PET/CT scan, patients were administrated in drinking 300 mL of water to expand stomach and performed additional scan on stomach region. Not only PET/CT scan but also CT performs this water-administration, and patients were take oral solution to make stomach expand for stomach cancer. When this scan performed, patients lay supine position. In this study, we evaluated the capacity of stomach through PET/CT scan with drinking water performed in supine and prone position so that we can distinguish exact location of cancer around pylorus and inferior wall of stomach. Furthermore, image data from supine and prone positions were analyzed the difference of volume of stomach through the change of standardized uptake values.
Materials and Methods: From July 2009 to January 2010 in severance hospital, 30 patients who were diagnosed as early gastric cancer or advanced gastric cancer were chosen. All patients had PET/CT scan before the operation and have had follow-up PET/CT. The patients fast for at least 8 hours, and had an injection intravenously with 18F-FDG, 7.4 MBq (0.2
mCi/kg) per kilogram. They were rested for 60 minutes. Before the examination, all patients were administrated to drink water for 300 mL Patients had PET/CT scan with supine position around the region of stomach, whole body, and around the region of stomach with prone position after drinking another 300 mL of water respectively.
Results: As a results of comparison between stomach capacity of 30 patients in supine and prone position, the
study draw results that average capacity of stomach body was 460.29 mm2 in supine position, and 641.39 mm2 in prone position for 30 patients. The change of capacity shows 41.3% expanded in prone position. And there was no noticeable difference at maximum standardized uptake values in supine position and prone position.
Conclusion: As results, stomach would have more expanded capacity in prone position than supine position. For patients who have physical disabilities to move freely, additional scan in prone position will be obstacle to perform. However, if additional scan in supine position add with the scan in prone position, it will be easier to diagnose stomach cancer. Moreover, we believe that this study will help the research for inventing support tools for patients who have physical disabilities in prone position.
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KEYWORD
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Stomach cancer , PET/CT , Prone position
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